books.google.com - Over the past 200 years, our knowledge of stars has expanded enormously. From seeing myriad dots of different brightnesses, we haved moved on to measure their distances, temperatures, sizes, chemical compositions, and even ages, finding both young and ancient stars that dwarf our Sun and are dwarfed...https://books.google.com/books/about/Extreme_Stars.html?id=3kcjvYLh8xIC&q=naked-eye&utm_source=gb-gplus-shareExtreme Stars